Street art is genre related to graffiti writing, but separate and with different rules and traditions. Where modern-day graffiti revolves around 'tagging' and text-based subject matter, Street art is far more open and is often related to graphic design. There are no rules in Street art, so anything goes, however, some common materials and techniques include fly-posting (also known as wheat-pasting), stencilling, stickers, freehand drawing and projecting videos. Street artists will often work in studios, hold gallery exhibitions or work in other creative areas: they are not anti-art, they simply enjoy the freedom of working in public without having to worry about what other people think. Many well-known artists started their careers working in a way that we would now consider to be Street art, for example, Gordon Matta-Clark, Jenny Holzer and Barbara Kruger.